/**
 * Copyright 2014 Zhenguo Jin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package me.itxuye.moment.utils;

/**
 * Singleton helper class for lazily initialization.
 *
 * @author jingle1267@163.comy
 * @date 2014-9-11
 */
public abstract class Singleton<T> {
  private T mInstance;

  protected abstract T create();

  public final T get() {
    synchronized (this) {
      if (mInstance == null) {
        mInstance = create();
      }
      return mInstance;
    }
  }
}
